[Stoves] Making bricks

[Kevin Chisholm]

Dear Crispin

Thanks very much for your elaboration on failure mechanism of adobe 
brick in wet environments.

What about alternate wetting and drying with water having a salt 
content? How important is stress in the adobe brick that is caused by 
salt crystal growth?

Certainly, anything that would make the brick less absorbant and 
permeable would also reduce this possible problem.

Thanks for your insights.

Kevin

Crispin Pemberton-Pigott wrote:
> Dear Frank
> 
> Kevin wrote:
> 
>> OK... so the 240 PSI is not the problem... the problem was wetting of the
> brick. Going to a 300 psi brick will >not solve the water problem...
> 
> Actually is will help if it is the same material, because in order to have a
> higher strength it will have to be denser and that means less permeable.
> 
> For foundations and the first three courses the bricks should have 15%
> cement added, or if it is high clay soil, 15% lime instead.
> 
> The deterioration is most likely due to differential thermal expansion which
> trumps wall mass every time when it comes to internal stress.
> 
> Regards
> Crispin
> 
> 
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